alternative definition added almost 15 years ago by Istvan Miko
Arising at the distal ends of the anterior tentorial arms or on the inner surface of the head capsule adjacent to the anterior tentorial pits; they insert on the lateral surface of the arms of the sitophore.
Reference: Vilhelmsen, L. 1996. The preoral cavity of lower Hymenoptera (Insecta): comparative morphology and phylogenetic significance. Zoologica Scripta 25:143-170.
Cross reference:
None provided.